1220151551 has 2 divisors, whose sum is σ = 1220151552. Its totient is φ = 1220151550.

The previous prime is 1220151547. The next prime is 1220151563. The reversal of 1220151551 is 1551510221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220151551 - 2² = 1220151547 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220151511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610075775 + 610075776.

It is an arithmetic number, because the mean of its divisors is an integer number (610075776).

Almost surely, 2^1220151551 is an apocalyptic number.

1220151551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220151551 is an equidigital number, since it uses as much as digits as its factorization.

1220151551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 1220151551 is about 34930.6677720309. The cubic root of 1220151551 is about 1068.5739733304.

Adding to 1220151551 its reverse (1551510221), we get a palindrome (2771661772).

The spelling of 1220151551 in words is "one billion, two hundred twenty million, one hundred fifty-one thousand, five hundred fifty-one".